import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';

const PUBLIC_PATHS = [
  '/login',
  '/api/auth',
  '/api/backoffice/auth',
  '/manifest.json',
  '/manifest.webmanifest',
  '/favicon.ico',
];

export function proxy(request: NextRequest) {
  const { pathname } = request.nextUrl;

  // Allow public paths (including PWA manifest, which Authelia was intercepting)
  if (PUBLIC_PATHS.some((p) => pathname === p || pathname.startsWith(p + '/'))) {
    return NextResponse.next();
  }

  // The identity backend issues the mdv_session cookie. Keep legacy names
  // accepted during migration, but do not redirect valid current sessions.
  const cookie = request.headers.get('cookie') ?? '';
  const hasSession =
    cookie.includes('mdv_session=') ||
    cookie.includes('backoffice_session=') ||
    cookie.includes('session_token=');

  if (!hasSession) {
    // API callers expect JSON. Redirecting them to /login makes fetch() follow
    // the redirect and receive the HTML login page, which surfaces as the
    // cryptic "Unexpected token '<'" parse error in the terminal UI.
    if (pathname.startsWith('/api/')) {
      return NextResponse.json(
        { error: { statusCode: 401, code: 'UNAUTHORIZED', message: 'Authentication required' } },
        { status: 401 },
      );
    }
    return NextResponse.redirect(new URL('/login', request.url));
  }

  return NextResponse.next();
}

export const config = {
  matcher: ['/((?!_next/static|_next/image|favicon.ico).*)'],
};